HP Cache Server Appliance Administrator Guide

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Chapter 4 Transparent Proxy Caching
WCCP provides the following routing benefits:
• The WCCP-enabled router and Traffic Server exchange heartbeat messages, letting each other know they
are running. The WCCP router automatically reroutes port 80 traffic (and port 119 traffic in WCCP 2.0) if
the Traffic Server goes down.
• If several Traffic Servers receive traffic from a WCCP router, WCCP balances the load among the Traffic
Servers. The group of Traffic Servers is called a WCCP cache farm.SeeAbout WCCP load balancing‚ on
page 27.
• Traffic Server handles node failure in WCCP cache farms. If one node becomes unavailable, its load is
redistributed among the remaining nodes.
• In WCCP 2.0, you can use multiple routers. Traffic flowing through multiple routers can share the same
pool of caches.
Enabling WCCP on Traffic Server
You enable WCCP on Traffic Server by editing the records.config file.
The following procedures describe how to enable WCCP on Traffic Server after installation. Different
procedures are provided for TelnetWCCP 1.0 and WCCP 2.0. Follow the procedure appropriate for your
environment.
To enable WCCP 1.0 after Traffic Server installation:
1. Telnet into the HP web cache appliance and select Shell Access as described in Overview of Access
Methods‚ on page 7.
2. Open the
records.config file located in the Traffic Server’s config directory with Vi.
3. Set the following variable to 1:
proxy.config.wccp.enabled INT 1
4. Edit the following variable to specify the IP address of the WCCP router that is sending traffic:
proxy.config.wccp.router_ip STRING router_IP_address
5. Save and close the records.config file.
6. Run the command
traffic_line -x to apply the configuration changes.
IMPORTANT Before you enable WCCP on Traffic Server, make sure that your configuration meets
the following requirements:
- The WCCP 1.0 router is running Cisco IOS Release 11.1(18)CA or 11.2(13)P or
newer. The WCCP 2.0 router is running Cisco IOS Release 12.0(3)T or newer. Check
Cisco Systems’s home page for a list of the platforms that support WCCP.
- If you are using several Traffic Server nodes, determine whether you want the Traffic
Server nodes to have management-only clustering or full clustering (refer to About
WCCP load balancing‚ on page 27).
- Each Traffic Server must have the transparency option installed.
- Each Traffic Server must have ARM configured. WCCP must be enabled on the
router that is sending traffic to Traffic Server. Instructions for enabling WCCP on
Cisco routers is provided on Cisco Systems’s home page.